In case you want to ensure files are written/deleted only if the commit succeeds, this plugin is for you.

what it does

The plugin simply adds the after_commit method to your ActiveRecord models and ensures that the code in the block is only executed if and after the top-most transaction succeeds.

usage

Once the plugin is in the vendor/plugins folder, you can write the following code in your save/destroy hooks (or anywhere else that is run inside a transaction):

def some_callback
  after_commit do
    # write file, clear cache, etc
  end
end

download

Get the plugin here

[edit]

The plugin is now part of the new versions gem which enables automatic versioning, multiversions and shared attachments.